Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fd54a78e4c5404…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 08:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f9c159756e4d46aec7657f781428d15 SHA-1: dcac746b49fc33aed6e9b51764499c4b6bb851da SHA-256: 49fd54a78e4c5404f79e857f107200033859cea8cd04ba9ee7a20412390577a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external URLs. These URLs are likely part of a phishing or malware distribution campaign, leveraging the PDF as a lure. The presence of embedded URIs and the PDF structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=live+tv+for+android+tv+india PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7fca9b56c---73414982918.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/wuwevutabamowokop.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/nuzowijitirumixevuja.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/72936304071.pdfIn PDF document text
    • http://egitara.com/upfiles/files/72035434400.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/falaji.pdfIn PDF document text
    • https://migger.dk/userimages/file/xuforusalosaralewosale.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/24631746003.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/rigelevenudo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/putot.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/xodikigubike.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gudazugesodegabur.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/49803552929.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/25410138723.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/tupejerimo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b390716e547580fabd0f2f0f063186a/99914454991.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mupesokevipumibebagamedux.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/77053299565.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/vapevu.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/lixitijoxatosovamejag.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/45098712198.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/sefotububurutitiloduvobu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/venibarusabepixi.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/97462702622.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 17392 bytes
SHA-256: ca5206ee14b4c14a3f810f29913e1fc715dbc3413054b1796bbe7d5510571d4a
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 10156 bytes
SHA-256: 59b5534d4673686658fe1083f2e6248276d661fc824fee1b5d5b750601315248

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